H. Tamura et al., PREPARATION OF YBA2CU4O8 SUPERCONDUCTOR USING POLYMER-GELATION METHODWITH POLYVINYL-ALCOHOL, Chemistry Letters, (6), 1994, pp. 1147-1148
Calcination and sintering of the precursor gel prepared from polyvinyl
alcohol and metal nitrates gave pure YBa2Cu4O8 superconductor. Using
this method, pure phase of YBa2Cu4O8 superconductor can be prepared in
a short heat treatment time compared with the conventional method.